@Kylearan: The reason for the low pace of most C64 demos can be found in the hardware (<1 Mhz CPU, 64 KB memory, super-slow serial-bus-floppy-drive, etc...). Coding a C64 Trackmo is more like doing 20 4K Intros linked together with 20 256 Byte Intros as loading or transition screen. Every single Byte counts.
When you see a C64 Demo without obvious loadingpauses and halfway decent pace, you should just be uttlerly impressed.